The word you use when you are talking about something that happened in the recent past, but you can't remember the exact day (due to a black out), or it really doesn't have any significance to the story...or you just can't be bothered to think hard enough to remember it.
Amber: I just went to a Ween concert in Anaheim.
Penny: Really, when was that?
Amber: Lasterday, I think.
Penny: Really, when was that?
Amber: Lasterday, I think.
by DeedleDawn October 7, 2009
Get the Lasterdaymug. by Teatime777 December 28, 2015
Get the Lasterdaymug. by Angelpie November 27, 2012
Get the Lasterdaymug. I smashed on this beezy lasterday.
by Antdizzle310 June 17, 2013
Get the Lasterdaymug. by ShadowCaster07 May 9, 2011
Get the Lasterdaymug. by Ded Jezter June 4, 2016
Get the Lasterdaymug. by keywestgrl January 21, 2013
Get the Lasterdaymug.